io.c revision 208825 
1/*-
2 * Copyright (c) 1989, 1993, 1994
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 4. Neither the name of the University nor the names of its contributors
14 *    may be used to endorse or promote products derived from this software
15 *    without specific prior written permission.
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27 * SUCH DAMAGE.
28 */
29
30#ifndef lint
31static const char copyright[] =
32"@(#) Copyright (c) 1989, 1993\n\
33	The Regents of the University of California.  All rights reserved.\n";
34#endif
35
36#if 0
37#ifndef lint
38static char sccsid[] = "@(#)calendar.c  8.3 (Berkeley) 3/25/94";
39#endif
40#endif
41
42#include <sys/cdefs.h>
43__FBSDID("$FreeBSD: head/usr.bin/calendar/io.c 208825 2010-06-05 11:06:56Z edwin $");
44
45#include <sys/param.h>
46#include <sys/stat.h>
47#include <sys/wait.h>
48#include <ctype.h>
49#include <err.h>
50#include <errno.h>
51#include <langinfo.h>
52#include <locale.h>
53#include <pwd.h>
54#include <stdio.h>
55#include <stdlib.h>
56#include <string.h>
57#include <unistd.h>
58
59#include "pathnames.h"
60#include "calendar.h"
61
62const char *calendarFile = "calendar";	/* default calendar file */
63const char *calendarHomes[] = {".calendar", _PATH_INCLUDE};	/* HOME */
64const char *calendarNoMail = "nomail";	/* don't sent mail if this file exist */
65
66char	path[MAXPATHLEN];
67
68struct fixs neaster, npaskha, ncny, nfullmoon, nnewmoon;
69struct fixs nmarequinox, nsepequinox, njunsolstice, ndecsolstice;
70
71#define	REPLACE(string, slen, struct_) \
72		if (strncasecmp(buf, (string), (slen)) == 0 && buf[(slen)]) { \
73			if (struct_.name != NULL)			      \
74				free(struct_.name);			      \
75			if ((struct_.name = strdup(buf + (slen))) == NULL)    \
76				errx(1, "cannot allocate memory");	      \
77			struct_.len = strlen(buf + (slen));		      \
78			continue;					      \
79		}
80void
81cal(void)
82{
83	char *pp, p;
84	FILE *fp;
85	int ch, l;
86	int count, i;
87	int month[MAXCOUNT];
88	int day[MAXCOUNT];
89	int year[MAXCOUNT];
90	char **extradata;	/* strings of 20 length */
91	int flags;
92	static int d_first = -1;
93	char buf[2048 + 1];
94	struct event *events[MAXCOUNT];
95	struct tm tm;
96	char dbuf[80];
97
98	extradata = (char **)calloc(MAXCOUNT, sizeof(char *));
99	for (i = 0; i < MAXCOUNT; i++) {
100		extradata[i] = (char *)calloc(1, 20);
101	}
102
103	/* Unused */
104	tm.tm_sec = 0;
105	tm.tm_min = 0;
106	tm.tm_hour = 0;
107	tm.tm_wday = 0;
108
109	count = 0;
110	if ((fp = opencal()) == NULL)
111		return;
112	while (fgets(buf, sizeof(buf), stdin) != NULL) {
113		if ((pp = strchr(buf, '\n')) != NULL)
114			*pp = '\0';
115		else
116			/* Flush this line */
117			while ((ch = getchar()) != '\n' && ch != EOF);
118		for (l = strlen(buf);
119		     l > 0 && isspace((unsigned char)buf[l - 1]);
120		     l--)
121			;
122		buf[l] = '\0';
123		if (buf[0] == '\0')
124			continue;
125
126		/* Parse special definitions: LANG, Easter, Paskha etc */
127		if (strncmp(buf, "LANG=", 5) == 0) {
128			(void)setlocale(LC_ALL, buf + 5);
129			d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
130			setnnames();
131			continue;
132		}
133		REPLACE("Easter=", 7, neaster);
134		REPLACE("Paskha=", 7, npaskha);
135		REPLACE("ChineseNewYear=", 15, ncny);
136		REPLACE("NewMoon=", 8, nnewmoon);
137		REPLACE("FullMoon=", 9, nfullmoon);
138		REPLACE("MarEquinox=", 11, nmarequinox);
139		REPLACE("SepEquinox=", 11, nsepequinox);
140		REPLACE("JunSolstice=", 12, njunsolstice);
141		REPLACE("DecSolstice=", 12, ndecsolstice);
142		if (strncmp(buf, "SEQUENCE=", 9) == 0) {
143			setnsequences(buf + 9);
144			continue;
145		}
146
147		/*
148		 * If the line starts with a tab, the data has to be
149		 * added to the previous line
150		 */
151		if (buf[0] == '\t') {
152			for (i = 0; i < count; i++)
153				event_continue(events[i], buf);
154			continue;
155		}
156
157		/* Get rid of leading spaces (non-standard) */
158		while (isspace((unsigned char)buf[0]))
159			memcpy(buf, buf + 1, strlen(buf));
160
161		/* No tab in the line, then not a valid line */
162		if ((pp = strchr(buf, '\t')) == NULL)
163			continue;
164
165		/* Trim spaces in front of the tab */
166		while (isspace((unsigned char)pp[-1]))
167			pp--;
168
169		p = *pp;
170		*pp = '\0';
171		if ((count = parsedaymonth(buf, year, month, day, &flags,
172		    extradata)) == 0)
173			continue;
174		*pp = p;
175		if (count < 0) {
176			/* Show error status based on return value */
177			fprintf(stderr, "Ignored: %s\n", buf);
178			if (count == -1)
179				continue;
180			count = -count + 1;
181		}
182
183		/* Find the last tab */
184		while (pp[1] == '\t')
185			pp++;
186
187		if (d_first < 0)
188			d_first = (*nl_langinfo(D_MD_ORDER) == 'd');
189
190		for (i = 0; i < count; i++) {
191			tm.tm_mon = month[i] - 1;
192			tm.tm_mday = day[i];
193			tm.tm_year = year[i] - 1900;
194			(void)strftime(dbuf, sizeof(dbuf),
195			    d_first ? "%e %b" : "%b %e", &tm);
196			if (debug)
197				fprintf(stderr, "got %s\n", pp);
198			events[i] = event_add(year[i], month[i], day[i], dbuf,
199			    ((flags &= F_VARIABLE) != 0) ? 1 : 0, pp,
200			    extradata[i]);
201		}
202	}
203
204	event_print_all(fp);
205	closecal(fp);
206}
207
208FILE *
209opencal(void)
210{
211	uid_t uid;
212	size_t i;
213	int fd, found, pdes[2];
214	struct stat sbuf;
215
216	/* open up calendar file as stdin */
217	if (!freopen(calendarFile, "r", stdin)) {
218		if (doall) {
219			if (chdir(calendarHomes[0]) != 0)
220				return (NULL);
221			if (stat(calendarNoMail, &sbuf) == 0)
222				return (NULL);
223			if (!freopen(calendarFile, "r", stdin))
224				return (NULL);
225		} else {
226			char *home = getenv("HOME");
227			if (home == NULL || *home == '\0')
228				errx(1, "cannot get home directory");
229			if (chdir(home) != 0)
230				errx(1, "cannot enter home directory");
231			for (found = i = 0; i < sizeof(calendarHomes) /
232			    sizeof(calendarHomes[0]); i++)
233				if (chdir(calendarHomes[i]) == 0 &&
234				    freopen(calendarFile, "r", stdin)) {
235					found = 1;
236					break;
237				}
238			if (!found)
239				errx(1,
240				    "can't open calendar file \"%s\": %s (%d)",
241				    calendarFile, strerror(errno), errno);
242		}
243	}
244	if (pipe(pdes) < 0)
245		return (NULL);
246	switch (fork()) {
247	case -1:			/* error */
248		(void)close(pdes[0]);
249		(void)close(pdes[1]);
250		return (NULL);
251	case 0:
252		/* child -- stdin already setup, set stdout to pipe input */
253		if (pdes[1] != STDOUT_FILENO) {
254			(void)dup2(pdes[1], STDOUT_FILENO);
255			(void)close(pdes[1]);
256		}
257		(void)close(pdes[0]);
258		uid = geteuid();
259		if (setuid(getuid()) < 0) {
260			warnx("first setuid failed");
261			_exit(1);
262		};
263		if (setgid(getegid()) < 0) {
264			warnx("setgid failed");
265			_exit(1);
266		}
267		if (setuid(uid) < 0) {
268			warnx("setuid failed");
269			_exit(1);
270		}
271		execl(_PATH_CPP, "cpp", "-P",
272		    "-traditional", "-nostdinc",	/* GCC specific opts */
273		    "-I.", "-I", _PATH_INCLUDE, (char *)NULL);
274		warn(_PATH_CPP);
275		_exit(1);
276	}
277	/* parent -- set stdin to pipe output */
278	(void)dup2(pdes[0], STDIN_FILENO);
279	(void)close(pdes[0]);
280	(void)close(pdes[1]);
281
282	/* not reading all calendar files, just set output to stdout */
283	if (!doall)
284		return (stdout);
285
286	/* set output to a temporary file, so if no output don't send mail */
287	(void)snprintf(path, sizeof(path), "%s/_calXXXXXX", _PATH_TMP);
288	if ((fd = mkstemp(path)) < 0)
289		return (NULL);
290	return (fdopen(fd, "w+"));
291}
292
293void
294closecal(FILE *fp)
295{
296	uid_t uid;
297	struct stat sbuf;
298	int nread, pdes[2], status;
299	char buf[1024];
300
301	if (!doall)
302		return;
303
304	rewind(fp);
305	if (fstat(fileno(fp), &sbuf) || !sbuf.st_size)
306		goto done;
307	if (pipe(pdes) < 0)
308		goto done;
309	switch (fork()) {
310	case -1:			/* error */
311		(void)close(pdes[0]);
312		(void)close(pdes[1]);
313		goto done;
314	case 0:
315		/* child -- set stdin to pipe output */
316		if (pdes[0] != STDIN_FILENO) {
317			(void)dup2(pdes[0], STDIN_FILENO);
318			(void)close(pdes[0]);
319		}
320		(void)close(pdes[1]);
321		uid = geteuid();
322		if (setuid(getuid()) < 0) {
323			warnx("setuid failed");
324			_exit(1);
325		};
326		if (setgid(getegid()) < 0) {
327			warnx("setgid failed");
328			_exit(1);
329		}
330		if (setuid(uid) < 0) {
331			warnx("setuid failed");
332			_exit(1);
333		}
334		execl(_PATH_SENDMAIL, "sendmail", "-i", "-t", "-F",
335		    "\"Reminder Service\"", (char *)NULL);
336		warn(_PATH_SENDMAIL);
337		_exit(1);
338	}
339	/* parent -- write to pipe input */
340	(void)close(pdes[0]);
341
342	write(pdes[1], "From: \"Reminder Service\" <", 26);
343	write(pdes[1], pw->pw_name, strlen(pw->pw_name));
344	write(pdes[1], ">\nTo: <", 7);
345	write(pdes[1], pw->pw_name, strlen(pw->pw_name));
346	write(pdes[1], ">\nSubject: ", 12);
347	write(pdes[1], dayname, strlen(dayname));
348	write(pdes[1], "'s Calendar\nPrecedence: bulk\n\n", 30);
349
350	while ((nread = read(fileno(fp), buf, sizeof(buf))) > 0)
351		(void)write(pdes[1], buf, nread);
352	(void)close(pdes[1]);
353done:	(void)fclose(fp);
354	(void)unlink(path);
355	while (wait(&status) >= 0);
356}
357